Device for continuously registering the revolutions of an internal combustion engine in consideration of the actual load



May23, 1939. UHER 2,159,236 DEVICE FOR CONTINUOUSLY REGISTERING THE REVOLUTIONS OF AN INTERNAL COMBUSTION ENGINE IN CONSIDERATION OF THE ACTUAL LOAD Filed OG'L 29, 1956 Edmond \MVENTOK,

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Patented May 23, 1939 UNITED STATES PATENT OFFIQE 2,159,236 DEVICE FOR CONTINUOUSLY REGISTER-- ING THE REVOLUTIONS OF AN NAL COMBUSTION INTER- ENGINE IN CONSID- ERATION OF THE ACTUAL LOAD Edmond Uher, Munich, Germany, assignor to In Germany November 4, 1935 6 Claims.

It is of the utmost importance for the economical working of a combustion engine to have means of determining, when the total stress on the engine has reached a point where an overhauling of the engine seems advisable.

The present invention has for its object to provide a very simple device to continuously register and indicate the total load taken up by the engine during its entire running period.

A further object of my invention is to provide a registering device, which is driven from the crank shaft of the engine by means of an adjustable gear and comprises means to vary the transmission ratio of said gear in dependence upon the pressure conditions in the intake pipe of the engine, As well known, the pressure condition in the intake pipe is directly proportional to the load and the engine.

Still another object of my invention is to provide a device of this character for indicating continuously the actual pressure prevailing in the intake pipe.

Further details are shown in the accompanying drawing, which illustratively exemplifies one embodiment of my invention.

Fig. 1 is a diagrammatic View of the entire arrangement, according to the invention, and

Fig. 2 shows a special part of the gear in active position.

In the drawing 23 denotes a rotary shaft driven by the engine and driving in turn by means of an eccentric 24 and a transverse arm 25, a rocking lever 21 pivoted at 28. A sliding collar 29 is arranged on the rocking lever 21 and is pivotally connected to the connecting bar 20, the other end of which is pivotally attached to the swinging arm 2|. The swinging arm 2| 1's fixed to a shaft 22, which is coupled by means of an intermittent movement to the registering device 33, 35, 36, 31. The transmission ratio between the pinions 33 and 36 is such, that a predetermined number of rotations of the shaft 23 at a middle position of the sliding collar 29 corresponds to one unit on the indicator wheel 31.

A pressure chamber I is connected to the intake pipe 4 of the engine by means of a short pipe 3 which enters short of the inlet openings to the cylinders. In this way all the usual operative features of the en ine cooperate in defining the pressure in the pressure chamber 4, which pressure always corresponds exactly to the actual load on the engine.

A pressure box 5 is supported in the pressure chamber 4 on a screw bolt 1, which depends from the upper wall of the pressure box and projects upwardly through an opening in the pressure chamber to receive a nut 8, which is screwed over the bolt and against the chamber to fix it in the desired position. By adjustment of the nut 8, the position of the pressure box 5 can be changed, in order to accommodate the device to different types of engines. The bottom of the pressure box 5 constitutes a diaphragm 5 carrying a spindle 9 projecting downwardly through a bearing in the bottom of the pressure chamber I.

A hanger or bracket Ill depends from the bottom of the chamber I and comprises a bearing H in which a two armed lever I3 is pivotally mounted. One arm of the lever I3 is connected adjacent its pivot point to the lower end of the spindle 9, while the extreme end of said arm is pivotally connected to the upper end of a link [8, the lower end thereof being pivotally connected to the mid portion of an arm 20.

The portion of the lever l3 beyond the spindle 9, comprises a temperature sensitive member in form of a bimetal bar l5, E6 to transmit the effect of changes in temperature to the connecting rod l8 and the gear 29, 20, 2|, 22.

The opposite end of the lever l3 carries a link l4 connected to a pointer 30 which moves over an arcuate scale 3!, the latter being arranged to slide in a second fixed arcuate scale 32. The slidable scale 3! is provided with graduations Which enable readings to be taken of the actual pressure in the pressure chamber l. The zero point 34 is arranged in the centre of the scale 3! which must be adjusted under the indicator 3!] before the engine is started. When the machine is not running, the indicator 30 indicates the prevailing atmospheric pressure in the intake pipe. The outer fixed scale 32 carries a barometric graduation so that the barometric pressure can be read upon this scale, when the engine is at rest.

The registering mechanism which may be calibrated in any suitable units, as, for instance, in horsepower-hours, operates as follows: Shaft 23 drives through crank 24, the arms 25 and 27, sliding collar 29, bar 20, and arm 2| to cause the shaft 22 to rotate intermittently in one direction, whereby the rotations of shaft 23 are registered on the counting wheel 31, The degree of the angular turns performed by shaft 22 on the individual rotations of shaft 23, depends upon the position of the sliding collar 29, on the lever 21. The sliding collar 29 is shifted upwardly and downwardly by the movement of the spindle 9 according to the pressure conditions in the intake pipe 4.

When the load on the engine is small, the pressure falls in the intake pipe 4 and in the pressure chamber l. The diaphragm 6 is projected outwardly by the pressure in the pressure box 5, and the needle 9, the right arm of lever [3, rod l8, bar 20 and collar 29 are lowered. When the sliding collar 29 approaches the pivot point 28 of lever 21, the movements of the gear parts 29, 20, 2| and the angular turn of shaft 22 per rotation of shaft 23 are reduced. When the load on the engine increases, the collar moves and just the opposite happens. The diaphragm returns to its normal position and the spindle 9, the right arm of lever I3, rod l8 and bar. 20 lifts the collar 29 on the lever 21. The distance between the collar 29 and the: pivot point 28 and the angular turn of shaft 22 per rotation of shaft 22 are accordingly increased. Thus the registration of the shaft rota.- tions is corrected in dependence upon the pressure conditions in the intake pipe.

Fig. 2 illustrates the working of the bimetallic bar l5, It arranged in the right arm of lever l3, e. g., upon a fall of temperature. The upper bar it contacts more than the lower bar it, the rod i8 is raised and the angular turn of shaft 22 per rotation of shaft 23 is increased, because one and the same pressure at a lower temperature corresponds to a higher load than at a higher temperature. It is suilicient if the temperature sensitive organ is arranged in the neighborhood of the: intake pipe, because the temperature of the gas in the intake pipe is practically identical with that of the atmosphere in the neighborhood of the in.- take pipe.

What I claim is:

1. A registering device for indicating the total load taken up by a combustion engine during its running period, comprising a register, an adjustable gear driven by the crank shaft of the engine and adapted to drive said register, a pressure chamber connected to and subject to the premure in the intake pipe, a pressure box adjustably arranged in said chamber, a diaphragm forming the bottom of said pressure box, a spindle fixed to said diaphragm and projecting downwardly through the bottom of the pressure chamber, and a lever system connecting said spindle to said adjustable gear whereby the transmission ratio of the latter is varied in dependence upon the pressure conditions in the intake pipe.

2. A device, as claimed in claim 1, comprising further a bimetal bar arranged in the neighborhood of the intake pipe and constituting part of said lever system, so as to change the transmission ratio of the adjustable gear also in dependence upon the temperature conditions in the neighborhood of the intake pipe.

3. A registering device for indicating the total load taken upon by a combustion engine during its running period, said device comprising a register, a crank arm driven by the crank shaft of the engine, a swinging lever actuated by said crank arm, a s'lidable collar adjustable on said lever, a swinging arm intermittently actuating said register, a bar connecting said sliding collar with said swinging arm, a pressure chamber connected to and subject to the pressure in the intake pipe of the engine, a pressure box within such pressure chamber a diaphragm forming the bottom of said pressure box, a spindle fixed to said diaphragm and projecting downwardly through the bottom of said pressure chamber, a double armed lever pivotally arranged below said pressure chamber, one arm of said lever being pivotally' connected to said bar and said spindle and including a bimetal bar, an adjustable scale, and a pointer moving over said scale, said pointer being driven by the second arm of said two-armed lever.

4. A registering device for indicating the total load taken up by a combustion engine during its running period, comprising a register, an adjustable gear including a crank arm driven by the crank shaft of the engine, a swinging lever actuated by said crank arm, a slidable collar adjustable on said lever, a swinging arm actuating said register and a bar connecting the free end of said swinging arm with said collar, and means to vary the position of said sliding collar on said lever and thus the transmission ratio of said gear in dependence upon the pressure conditions in the intake pipe of the engine.

5. A device as claimed in claim 4, in which said means for varying the transmission ratio of the gear in dependence upon the pressure conditions in the intake pipe of the engine comprises a presure chamber connected to and subject to the pressure in the intake pipe, a pressure box adjustably arranged in said chamber, a diaphragm forming the bottom of said pressure box, a spindle fixed to said diaphragm and projecting downwardly through the bottom, of saidpressure chamber and a lever system connecting said spindle to said sliding collar. 7

6. A device as claimed in claim 4, comprising as a further element included in the means for varying the transmission ratio of the gear a bi-, metal bar arranged in the neighborhood of the intake pipe and connected with said adjustable gear, so as to change the transmission ratio of the latter also in dependence upon the temperature conditions in the neighborhood of the intake pipe.

EDMOND UHER. 

